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we can use r <= rows if we want at least rows iterations-but what if we want to ensure that rows is the exact number Then we must test a more complicated condition, such as r == rows + 1 This extra complexity offers no compensating advantage
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Expressions: C++ inherits a rich set of operators from C, several of which we have already used In addition, as we've already seen with the input and output operators, C++ programs can extend the core language by defining what it means to apply built-in operators to objects of class type Correctly understanding complicated expressions is a fundamental prerequisite to effective programming in C++ Understanding such expressions requires understanding How the operands group, which is controlled by the precedence and associativity of the operators used in the expression How the operands will be converted to other types, if at all The order in which the operands are evaluated Different operators have different precedence Most of the operators are left-associative, although the assignment operators and the operators taking a single argument are right-associative We list the most common operators here-regardless of whether we've used them in this chapter We've ordered them by precedence from highest to lowest, with a double line separating groupings with the same precedence xy The member y of object x x[y] The element in object x indexed by y x++ Increments x, returning the original value of x x-Decrements x, returning the original value of x ++x --x !x x* y x/y x%y x+ y x- y x >> y Increments x, returning the incremented value Decrements x, returning the decremented value Logical negation If x is true then !x is false Product of x and y Quotient of x and y If both operands are integers, the implementation chooses whether to round toward zero or - Remainder of x divided by y, equivalent to x - ((x / y) * y) Sum of x and y Result of subtracting y from x For integral x and y, x shifted right by y bits; y must be non-negative If x is an istream, reads from x into y For integral x and y, x shifted left by y bits; y must be non-negative If x is an ostream, writes y onto x Relational operators yield a bool indicating the truth of the relation The operators (<, >, <=, and >=) have their obvious meanings Yields a bool indicating whether x equals y Yields a bool indicating whether x is not equal to y Yields a bool indicating whether both x and y are true Evaluates y only if x is true Yields a bool indicating whether either x or y is true Evaluates y only if x is false Assign the value of y to x, yielding x as its result
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Compound assignment operators; equivalent to x = x op y, where op is an arithmetic or shift operator Yields y1 if x is true; y2 otherwise Evaluates only one of y1 and y2
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There is usually no guarantee as to the order in which an expression's operands are evaluated Because the order of evaluation is not fixed, it is important to avoid writing a single expression in which one operand depends on the value of another operand We'll see an example in 415/60 Operands will be converted to the appropriate type when possible Numeric operands in expressions or relational expressions are converted by the usual arithmetic conversions described in detail in A244/304 Basically, the usual arithmetic conversions attempt to preserve precision Smaller types are converted to larger types, and signed types are converted to unsigned Arithmetic values may be converted to bool: A value of 0 is considered false; any other value is true Operands of class type are converted as specified by the type We'll see in 12 how to control such conversions Types: bool Built-in type representing truth values; may be either true or false unsigned Integral type that contains only non-negative values short Integral type that must hold at least 16 bits long Integral type that must hold at least 32 bits size_t Unsigned integral type (from <cstddef>) that can hold any object's size string::size_type Unsigned integral type that can hold the size of any string Half-open ranges include one but not both of their endpoints For example, [1, 3) includes 1 and 2, but not 3 Condition: An expression that yields a truth value Arithmetic values used in conditions are converted to bool: Nonzero values convert to true; zero values convert to false Statements: using namespace-name::name; Defines name as a synonym for namespace-name::name type-name name; Defines name with type type-name type-name name = value; Defines name with type type-name initialized as a copy of value type-name name(args);
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